<pre>I believe the SOAP feature was introduced from 7.x onwards and
previously we were using HTTP based request.

So in case, for developing the appropriate WSDLs for SOAP client
application, you may need to upgrade your MP to 7.x.


For more details on different MP versions please refer
http://www.cisco.com/en/US/products/ps9894/index.html


Hope this clarifies.
</pre>